S92.345B Nondisplaced fracture of fourth metatarsal bone, left foot, initial encounter for open fracture

Name of the Condition

• Nondisplaced fracture of fourth metatarsal bone, left foot, initial encounter for open fracture
• ICD-10 code: S92.345B

Summary

A nondisplaced fracture of the fourth metatarsal bone in the left foot is a break in the long bone of the forefoot where the bone fragments remain in their normal alignment. This injury is classified as an open fracture, meaning the skin over the fracture site is broken, and it is documented as the initial encounter for treatment. Open fractures require prompt evaluation to assess for contamination and appropriate management.

Causes

Direct trauma to the left foot, such as a fall, impact during sports, or a heavy object dropped on the foot, is a common cause. Open fractures may also result from high-energy injuries that penetrate the skin, exposing the bone. Repetitive stress or overuse can contribute to stress fractures, which may become open if not treated promptly.

Risk Factors

• Participation in high-impact sports (e.g., running, basketball, soccer)
• Wearing improper or non-supportive footwear
• Conditions that weaken bones, such as osteoporosis
• Advanced age, which may reduce bone density and balance
• Previous foot injuries or fractures
• Activities involving sudden, forceful impacts to the foot

Symptoms

• Pain localized to the outer midfoot area of the left foot
• Swelling and bruising around the affected bone
• Difficulty bearing weight or walking on the left foot
• Visible wound or break in the skin over the fracture site
• Possible bleeding or discharge from the open wound

Diagnosis

A healthcare provider will perform a physical examination to assess pain, swelling, and range of motion. Imaging tests, such as X-rays, are typically used to confirm the fracture and evaluate alignment. For open fractures, the provider will also assess the wound for contamination, size, and depth. Additional tests, like a CT scan, may be ordered if further detail is needed.

Treatment Options

Treatment focuses on cleaning the wound to prevent infection, stabilizing the fracture, and promoting healing. This may include irrigation and debridement of the open wound, followed by immobilization with a cast or splint. Antibiotics are often prescribed to reduce infection risk. Pain management and elevation of the foot may also be recommended. Surgical intervention is rarely needed for nondisplaced fractures but may be considered if the wound is severe.

Prognosis and Follow-Up

With proper treatment, most nondisplaced open fractures of the fourth metatarsal heal within 6–8 weeks. Follow-up appointments are important to monitor healing and ensure the wound is healing without infection. Weight-bearing may be restricted initially and gradually increased as tolerated. Physical therapy may be recommended to restore strength and mobility once the fracture is stable.

Complications

• Infection at the wound site
• Delayed healing or nonunion of the fracture
• Chronic pain or stiffness in the foot
• Nerve or tissue damage from the open wound
• Risk of future fractures due to weakened bone

Lifestyle & Prevention

• Wear supportive, properly fitting footwear during activities.
• Avoid sudden increases in physical activity to reduce stress fracture risk.
• Use protective gear, such as toe guards, during high-impact sports.
• Maintain bone health through a balanced diet rich in calcium and vitamin D.
• Address foot pain promptly to prevent worsening injuries.

When to Seek Professional Help

Seek immediate medical attention if you experience a foot injury with an open wound, severe pain, or inability to bear weight. Signs of infection, such as increased redness, swelling, or pus, also require prompt evaluation.

Tips for Medical Coders

Document the fracture as nondisplaced and specify the left foot and open nature of the injury. Include details about the initial encounter for treatment, as this affects code assignment. Ensure the open fracture is clearly documented to distinguish it from closed fractures. Note the absence of displacement and the location (fourth metatarsal) to support accurate coding.